Linked Life Data

11033562

Source:http://linkedlifedata.com/resource/pubmed/id/11033562

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2000-12-1
pubmed:abstractText
The objective of this study was to determine the effect of porous bioactive glass (45S5) substrate characteristics on the expression and maintenance of the osteoblastic phenotype. We cultured ROS 17/2. 8 cells on substrates with different pore size and porosity for periods up to 14 days and analyzed the characteristics of the cells and extracellular matrix. Results of the study show that the glass substrates supported the proliferation and growth of osteoblast-like cells. Although the morphologies of the cells differed on the various substrates, their shape and the extent of membrane ruffling suggested that they maintained high levels of metabolic activity. Cells on all substrates expressed high levels of alkaline phosphatase activity and produced extracellular matrices that mineralized to form nonstoichiometric, carbonated, calcium-deficient apatites. An important finding was that at a given porosity of 44%, the pore size neither directed nor modulated the in vitro expression of the osteoblastic phenotype. In contrast, porosity did affect cellular function. We noted that at an average pore size of 92 microm, as the porosity increased from 35 to 59%, osteoblast activity was reduced. As designed in this experiment, an increase in the porosity led to a corresponding increase in total surface area of the specimens. With increasing porosity and surface area, glass reactions in the media may persist for longer durations at higher intensities, thereby affecting local media composition. As such, we suggest that extensive conditioning treatments before cell seeding can reduce this effect. Our results also revealed that the expression of the osteoblastic phenotype is enhanced by the ongoing glass dissolution. The reaction pathway at the origin of this effect still needs to be elucidated. Taken together, the findings support the overall hypothesis that in vitro cell activity can be controlled by a careful selection of substrate properties.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0021-9304
pubmed:author
pubmed:copyrightInfo
Copyright 2000 John Wiley & Sons, Inc.
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
52
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
783-96
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed-meshheading:11033562-Alkaline Phosphatase, pubmed-meshheading:11033562-Animals, pubmed-meshheading:11033562-Biocompatible Materials, pubmed-meshheading:11033562-Biological Markers, pubmed-meshheading:11033562-Bone Neoplasms, pubmed-meshheading:11033562-Calcium, pubmed-meshheading:11033562-Cell Differentiation, pubmed-meshheading:11033562-Cell Division, pubmed-meshheading:11033562-Cell Movement, pubmed-meshheading:11033562-Ceramics, pubmed-meshheading:11033562-Chemistry, Physical, pubmed-meshheading:11033562-DNA, pubmed-meshheading:11033562-Glass, pubmed-meshheading:11033562-Isoenzymes, pubmed-meshheading:11033562-Materials Testing, pubmed-meshheading:11033562-Microscopy, Electron, Scanning, pubmed-meshheading:11033562-Osteoblasts, pubmed-meshheading:11033562-Osteosarcoma, pubmed-meshheading:11033562-Phenotype, pubmed-meshheading:11033562-Phosphorus, pubmed-meshheading:11033562-Physicochemical Phenomena, pubmed-meshheading:11033562-Porosity, pubmed-meshheading:11033562-Rats, pubmed-meshheading:11033562-Spectroscopy, Fourier Transform Infrared, pubmed-meshheading:11033562-Surface Properties, pubmed-meshheading:11033562-Tumor Cells, Cultured
pubmed:year
2000
pubmed:articleTitle
Effect of varying physical properties of porous, surface modified bioactive glass 45S5 on osteoblast proliferation and maturation.
pubmed:affiliation
Department of Bioengineering, Center for Bioactive Materials and Tissue Engineering, University of Pennsylvania, 3320 Smith Walk, Philadelphia, Pennsylvania 19104, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, Non-P.H.S., Evaluation Studies